Tascam portastudio 488mkII tape speed


Just picked up a 488 for $25. It works mostly,needs sliders and pots cleaned. Just wondering about the tape speed. I put a 4 tk tape in to test the transport and it played fast. What I want to know is does this model run at a higher speed then the 4 tk recorders? Most of the speed problems I have seen are about running too slow....Just trying to get info before dig around inside it......Thanks